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327
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1
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2 /* Minitar: extract .tar.gz files on Win32 platforms.
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3 Uses zlib for decompression.
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4
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5 This is very simple-minded, it ignores checksums, and any type of file
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6 that is not a plain file or a directory. Nonetheless it is useful.
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7
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8 Author: Charles G. Waldman (cgw@pgt.com), Aug 4 1998
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9
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10 This file is placed in the public domain; you can
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11 do whatever you like with it. There is NO WARRANTY.
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12 If it breaks, you get to keep both pieces */
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13
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14
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15 #include <stdio.h>
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16 #include <Errno.h>
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17
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18 #include <zlib.h>
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19
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20 Usage(char *name)
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21 {
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22 fprintf(stderr,"Usage: %s file.tar.gz [base-dir]\n",name);
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23 fprintf(stderr,"\tExtracts the contents compressed tar file to base-dir\n");
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24 exit(-1);
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25 }
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26
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27
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28 #define BLOCKSIZE 512
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29 #define MAXNAMELEN 1024
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30
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31 int octal(char *str)
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32 {
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33 int ret = -1;
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34 sscanf(str,"%o",&ret);
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35 return ret;
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36 }
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37
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38 /* this is like mkdir -p, except if there is no trailing slash,
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39 the final component is assumed to be a file, rather than a
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40 path component, so it is not created as a directory */
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41
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42 int makepath(char *path)
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43 {
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44 char tmp[MAXNAMELEN];
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45 char *cp;
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46 extern int errno;
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47
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48 for (cp=path; cp; cp = (char*)strchr(cp+1,'/')){
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49 if (!*cp)
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50 break;
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51 if (*cp != '/')
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52 continue;
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53 strncpy(tmp, path, cp-path);
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54 tmp[cp-path] = '\0';
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55 if (strlen(tmp) == 0)
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56 continue;
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57 if (mkdir(tmp,0777)){
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58 if (errno == EEXIST)
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59 continue;
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60 else
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61 return -1;
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62 }
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63 }
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64 return 0;
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65 }
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66
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67
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68
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69
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70 main(int argc, char **argv)
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71 {
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72 char fullname[MAXNAMELEN];
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73 char *basedir = ".";
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74 char *tarfile;
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75 char *cp;
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76 int size;
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77 char osize[13];
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78 char name[101];
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79 char magic[7];
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80 char type;
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81
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82 gzFile *infile = (gzFile*)0;
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83 FILE *outfile = (FILE*)0;
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84
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85 char block[BLOCKSIZE];
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86 int nbytes, nread, nwritten;
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87
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88 int in_block = 0;
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89 int directory = 0;
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90
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91 if (argc < 2 || argc > 3)
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92 Usage(argv[0]);
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93
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94 tarfile = argv[1];
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95 if (argc==3)
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96 basedir = argv[2];
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97
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98 if (! (infile = gzopen(tarfile,"rb"))){
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99 fprintf(stderr,"Cannot open %s\n", tarfile);
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100 exit(-2);
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101 }
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102
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103 while (1){
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104
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105
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106 nread = gzread(infile,block,512);
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107
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108 if (!in_block && nread == 0)
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109 break;
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110
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111 if (nread != BLOCKSIZE){
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112 fprintf(stderr,"Error: incomplete block read. Exiting.\n");
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113 exit(-2);
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114 }
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115
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116 if (!in_block){
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117 if (block[0]=='\0') /* We're done */
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118 break;
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119
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120 strncpy(magic,block+257,6);
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121 magic[6] = '\0';
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122 if (strcmp(magic,"ustar ")){
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123 fprintf(stderr,
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124 "Error: incorrect magic number in tar header. Exiting\n");
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125 }
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126
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127 strncpy(name,block,100);
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128 name[100] = '\0';
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129 sprintf(fullname,"%s/%s",basedir,name);
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130 printf("%s\n",fullname);
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131 type = block[156];
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132
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133 switch(type){
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134 case '0':
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135 case '\0':
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136 directory = 0;
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137 break;
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138 case '5':
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139 directory = 1;
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140 break;
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141 default:
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142 fprintf(stderr,"Error: unknown type flag %c. Exiting.\n",type);
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143 break;
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144 }
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145
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146 if (directory){
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147 in_block = 0;
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148
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149 /* makepath will ignore the final path component, so make sure
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150 dirnames have a trailing slash */
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151
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152 if (fullname[strlen(fullname)-1] != '/')
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153 strcat(fullname,"/");
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154 if (makepath(fullname)){
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155 fprintf(stderr, "Error: cannot create directory %s. Exiting.\n",
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156 fullname);
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157 exit(-2);
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158 }
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159 continue;
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160 } else { /*file */
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161 in_block = 1;
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162 if (outfile){
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163 if (fclose(outfile)){
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164 fprintf(stderr,"Error: cannot close file %s. Exiting.\n",
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165 fullname);
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166 exit(-2);
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167 }
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168 outfile = (FILE*)0;
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169 }
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170
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171 if ( !(outfile = fopen(fullname,"wb"))){
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172 /*try creating the directory, maybe it's not there */
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173 if (makepath(fullname)){
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174 fprintf(stderr,"Error: cannot create file %s. Exiting.\n",
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175 fullname);
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176 exit(-2);
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177 }
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178 /* now try again to open the file */
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179 if (!(outfile = fopen(fullname,"wb"))){
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180 fprintf(stderr,"Error: cannot create file %s. Exiting.\n",
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181 fullname);
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182 exit(-2);
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183 }
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184 }
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185
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186 strncpy(osize,block+124,12);
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187 osize[12] = '\0';
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188 size = octal(osize);
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189 if (size<0){
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190 fprintf(stderr,"Error: invalid size in tar header. Exiting.\n");
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191 exit(-2);
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192 }
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193 }
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194 } else { /* write or continue writing file contents */
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195 nbytes = size>512? 512:size;
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196
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197 nwritten = fwrite(block, 1, nbytes, outfile);
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198 if (nwritten != nbytes){
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199 fprintf(stderr, "Error: only wrote %d bytes to file %s. Exiting.\n",
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200 nwritten, fullname);
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201 }
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202 size -= nbytes;
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203 if (size==0)
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204 in_block = 0;
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205 }
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206 }
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207 }
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208
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209
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210
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211
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